Kokubu Masaru (Bunta Sugawara) is a hard-headed, hot-tempered member of a street vendor clan run by an elderly boss (Kanjuro Arashi). They come into conflict with an unholy alliance of evil Yakuza bosses (Watanabe, Amatsu and Kawazu).
After escaping from an insane asylum, a medical student assumes the identity of a mysterious dead man, who appears to be his doppelganger, and gets lured to a sinister island ruled by a mad scientist and his malformed men.
